-snip-
New account now need to "KYC".
They change the rules for this-case, so even before you play I guess need to passed some "KYC" first. It's being change for new account, old account still can withdraw or access without "KYC" but they can ask you any KYC.
What you said is true and accounts that have been registered for a long time are still free from KYC, it's just that there have been several emails sent to old users to complete KYC to be able to get more bonuses because some time ago I got the email message.
But KYC is actually not a problem because Stake.com itself can be trusted so there is little possibility of data leakage from users.
Let's hope nothing changes for accounts that have been registered for a long time because most gamblers still maintain the anonymity they want.